Final answer:
The correct tag question to complete the sentence 'He did not come to the party' is '(B) didn't he', since tag questions have the opposite polarity to the statement.
Step-by-step explanation:
The question asks which tag question should follow the statement: "He did not come to the party". Tag questions are used in English to confirm the information already stated, and they are usually formed using the auxiliary or modal verb from the main sentence, with the subject pronoun.
They have the opposite polarity to the statement. If the statement is negative, the tag is positive, and vice versa. Therefore, the correct answer is (B) didn't he.